Pull-cord.



Patented 06. 24, 1901. w. A. TUCKER.

P U L L C 0 B D (Application flledAug. 1, 1901.)

(lo MudeL) INVENTOR 7mm WITNESSES:

ATTORNEY HE NdRRlS vzrsn: co., PH

UNITED STATES PATENT OFFICE.

WILLIAM A. TUCKER, OF NEw YORK, N. Y., ASSIGNOR TO TUCKER &.CAR ER ROPE COMPANY, A CORPORATION OF NEW YORK.

PULL-CORD.

SPECIFICATION formingpart of Letters Patent No. 689,662, dated December 24, 1901.

Application filed August 1, 1901- Serial No. 70,474. (No model.)

and maximum flexibility at comparatively low cost and which shall be adapted to be used as a bell-cord, as belting for transmission of power, for operating steering-gear of small vessels, and for other purposes where nonstretchability, flexibility, and strength are required in a pull-cord.

The invention consists of a pull-cord having a flexible steel core and a flexible exterior surrounding the core made of strands of fibrous material--such as cotton, jute, hemp, &c.-braided, twisted, or woven together. In the best form Of the invention the core has a central strand of fibrous material which is sheathed within a plurality of steel strands. The steel strands are generally twisted together, and each such strand preferably consists of a plurality of fine steel wires twisted together to form a strand.

In the accompanying drawings, forming part of this specification, I have shown one of the various embodiments of the invention, like reference-numerals referringto the same parts in both figures of the drawings.

Figure 1 is a side elevation showing the improved pull-cord, the strandsof the exterior being cut off to expose the core and all the strands of the cord being frayed and spread out. Fig. 2isatransverse section of the cord.

Referring now more particularly to the precise structure shown in the drawings, 1 is the exterior of the cord, composed of some seventeen separate strands 2 braided together, each strand being composed of a number of threads 3 twisted together to form a strand 2. The core 4. is composed of a plurality of separate steel strands 5 twisted together, each strand,

5 being composed of a plurality of separate fine steel wires (5 twisted together to form a strand 5. The core also preferably has, as shown, a central strand 7, sheathed within the core 4 and made of fibrous material. This central strand 7, shown in the drawings, is preferably made of a plurality of separate smaller com ponentstrands 8-twisted together, each such strand 8 being made of a number of threads twisted together.

Of course various modifications may be made in the structure of the cord without depart- 6o ing from the scope of the invention. For example, the strands composing the exterior and core may be varied in number, and the central strand 7 may in some cases be omitted. Again, the strands 5 of the core may be braided or woven together instead of being twisted together. The same is true of the strands 8.

By means of this invention a pull-cord is provided of superior quality and efficiency.

Pull-cords as heretofore made are subject to a Considerable degree of extensibility or stretch under the strains incident to use, and this is a recognized defect requiring frequent adjustment of the cord to maintain its efflciency. The problem of overcoming this defeet and of maintaining at the same time the requisite flexibility is successfully solved by this invention. At the same time the strength of the cord is greatly increased without increasing its size.

What I desire to claim and secure by Letters Patent is p 1. A non-stretchable, flexible pull-cord including in its structure a flexible core made of a central strand of fibrous material with a sheathing therefor made of separate steel strands twisted together, each strand of which consists of a plurality of tine wires twisted together; and a flexible exterior made of braided, twisted, or woven strands of fibrous material.

2. A non-stretchable, flexible pull-cord including in its structure a flexible core made Of a central strand of fibrous material with a sheathing therefor made of separate closelyassociated steel strands; and a flexible exterior made of braided, twisted, or woven strandsof fibrous material, said central strand name to this specification in the presence consisting of a plurality of threads twisted of two subscribing witnesses. together,and said sheathing consisting of steel strands twisted together, each steel strand WILLIAM TUCKER consisting of a plurality of fine Wires twisted Witnesses: together. NICHOLAS M. GOODLETT, J in,

In testimony whereof I have signed my ELMER E. COOLEY. 

